Hi,
I'm new on this board.
I already replaced the tail lights.
It's a 09/2010 118d E82 (german specs; Xenon). It was like plug&play - unfortunately I ordered the adaptor Cable, too. Using this cale, the tail indicators doesn't work anymore. It seems, the Cable changes the pins - so the inicators don't get any power.
Alsoyouwill get two more adaptor cables (y-cable) in this package, they complete useless. I try to take some Pictures of it.
So in conclusion:
Cars after 09/2010 are able to use the same origin cables and don't Need any coding or new FRM.
Bye& have a nice day.
Phil
EDIT:
This is the look of the high tail lights:
http://img140.imageshack.us/i/lcitaillights.jpg/
And this are the adaptor cables:
http://img192.imageshack.us/i/adaptorcables.jpg/
The below two cables (Y-cables) are IMHO useless, I can't find any possibility to connect the smaller ones.
I hope I can help you.